Skyrmionic LEGO- entangled skyrmion networks in chiral magnets and liquid crystals
| Project/Area Number |
21K03406
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 13010:Mathematical physics and fundamental theory of condensed matter physics-related
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| Research Institution | Hiroshima University |
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Principal Investigator |
LEONOV ANDRIY 広島大学, 先進理工系科学研究科(理), 准教授 (30804851)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Project Status |
Granted (Fiscal Year 2022)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | skyrmion / tilted spiral / A-phase / chiral magnets / Cu2OSeO3 / neutron scattering / cone / spiral / liquid crystals / chirality |
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| Outline of Research at the Start |
The aim of the project is by experimental and theoretical means to introduce different classes of oblique non-axisymmetric skyrmions and elucidate the principles of their meshing into a large diversity of extended three-dimensional skyrmionic networks in chiral magnets and liquid crystals.
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| Outline of Annual Research Achievements |
I finalized a systematic study of the stability and ordering of low temperature magnetic states in the bulk helimagnet Cu2OSeO3 done in collaboration with the group of Katia Pappas (Delft university, the Netherlands). We focused our attention on the temperature and field dependencies of the tilted spiral state that we observed persisting up to above T=35 K, i.e. up to higher temperatures than reported so far. Since the stability region of the skyrmion phase displays strongly hysteretic behavior for increasing and decreasing magnetic fields, we addressed this important point using micromagnetic simulations and came to the conclusion that skyrmion nucleation is underpinned by the reorientation of oblique spiral domains occurring near the critical magnetic fields of the phase diagrams.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
In spite of the relatively hard world situation due to the pandemic, the project progresses rather smoothly. It was possible to publish 8 papers in high-rank peer-reviewed journals. At the same time, it was impossible to travel abroad. Thus, the collaboration with the experimentalists in Europe and USA became rather slow. Moreover, due to the economic slump, many experimental facilities in Europe function irregularly. Therefore, the experimental part of the project is slightly delayed. On the average, however, the project progresses rather smoothly since the theoretical part progressed faster than expected.
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| Strategy for Future Research Activity |
The project progresses rather smoothly. As for the magnetic part, joint theoretical and experimental results on Cu2OSeO3 demonstrate rather good compliance. The future plans include addressing experimental results in other bulk helimagnets such as MnSi and FeGe.
As for the liquid-crystal part of the project, the theoretical modelling was completely finalized. The remaining point left are the experimental results in thin layers of chiral LCs. Thus, the future plans include explanation of the experiments obtained by the collaborators from the Smalyukh's group. Since presently, we are in the same institute (WPI-SKCM2), there is hope that we finalize this part of the project as well.
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Report
(2 results)
Research Products
(9 results)
